Evaluation of Modified Biofloc System with Filtration Unit in Controlling Suspended Solids and Inorganic Nitrogen Concentrations in a Recirculating Aquaculture System

2021 ◽  
Author(s):  
Suta Kunwong ◽  
Penpicha Satanwat ◽  
Sorawit Powtongsook ◽  
Wiboonluk Pungrasmi ◽  
Kasidit Nootong
Keyword(s):  
Suspended Solids ◽  
Inorganic Nitrogen ◽  
Recirculating Aquaculture System ◽  
Recirculating Aquaculture ◽  
Aquaculture System ◽  
Nitrogen Concentrations ◽  
Filtration Unit

scholarly journals Design and function of a nitrogen and sediment removal system in a recirculating aquaculture system optimized for aquaponics

2020 ◽  
Vol 26 (2) ◽  
pp. 190494-0
Author(s):  
Siriwanee Supajaruwong ◽  
Penpicha Satanwat ◽  
Wiboonluk Pungrasmi ◽  
Sorawit Powtongsook
Keyword(s):  
Utilization Efficiency ◽  
Plant Production ◽  
Nutrient Concentrations ◽  
Recirculating Aquaculture System ◽  
Plant Weight ◽  
Recirculating Aquaculture ◽  
Nutrient Utilization Efficiency ◽  
Aquaculture System ◽  
Filtration Unit ◽  
Complete Nitrification

Aquaponic systems (APSs) are based upon the sustainable utilization of nitrogen and phosphorus from a recirculating aquaculture system (RAS) as the nutrient source for plant production. Since the proper management of nitrogen and suspended solids are important for nutrient utilization efficiency, their optimization was evaluated. The RAS integrated with filtration unit and nitrifying biofilter provided complete nitrification without solid accumulation. Under the optimal treatment condition for 16 d, the treated water was low in ammonia (0 mg-N/L) and high in nitrate (> 6 mg-N/L) concentrations, which was appropriate for use in the cultivation of lettuce (Lactuca sativa). The RAS was then incorporated with hydroponics at a 5:1 fish: plant weight ratio. Moreover, the simplified APS was compared with a typical APS system that incorporated filtration unit and nitrifying biofilter. The natural growth of nitrifying microorganisms in the simplified APS could perform complete nitrification after 20 d of operation giving low ammonia and nitrite concentrations. The nutrient removal efficiency of the simplified APS resembled the typical system. During the aquaponics, the hydroponic unit in the aquaculture system was sufficient to control the nutrient concentrations within the appropriate levels for fish cultivation, i.e. nitrate (< 20 mg-N/L) and phosphate (< 3 mg-P/L).

scholarly journals Distribution of Pseudomonas fluorescens and Aeromonas hydrophila Bacteria in a Recirculating Aquaculture System during Farming of European Grayling (Thymallus thymallus L.) Broodstock

Water ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 376 ◽  
Author(s):  
Iwona Gołaś ◽  
Mariusz Szmyt ◽  
Jacek Potorski ◽  
Michał Łopata ◽  
Anna Gotkowska-Płachta ◽  
...  
Keyword(s):  
Aeromonas Hydrophila ◽  
Suspended Solids ◽  
Total Suspended Solids ◽  
Fish Biomass ◽  
Recirculating Aquaculture System ◽  
Thymallus Thymallus ◽  
Bacterial Populations ◽  
European Grayling ◽  
Recirculating Aquaculture ◽  
Aquaculture System

Pseudomonas fluorescens and Aeromonas hydrophila bacteria are opportunistic pathogens that occur naturally in the aquatic environment and in the gut flora of healthy fish. Both species can pose a serious threat for fish that are highly sensitive to water pollution. The aim of this study was to determine the extent to which the amount of administered fish feed and fish biomass affect the distribution and abundance of Ps. fluorescens and A. hydrophila bacteria in a recirculating aquaculture system (RAS) during farming of European grayling (Thymallus thymallus L.) broodstock. A total of 68 water samples from the inflow, two rearing tanks and the outflow as well as 17 feed samples were collected and analyzed separately. Bacterial populations were analyzed by the culture-dependent method and a molecular method (fluorescence in situ hybridization, FISH) to detect culturable strains and viable but non-culturable strains, respectively. Fish biomass, feed and 16 water quality parameters (temperature, pH, concentration of dissolved oxygen, oxygen saturation, five-day biochemical oxygen demand (BOD5), total phosphorus, total organic phosphorus and nitrogen, orthophosphates, total nitrogen, nitrite and nitrate nitrogen, ammonia nitrogen, ammonium nitrogen, total suspended solids, and total organic carbon) were the explanatory factors. Statistically significant differences (RM-ANOVA, p ≤ 0.05) were stated in bacterial abundance in samples from the inflow, rearing tanks and the outflow. Water samples from the RAS were abundantly colonized by non-culturable Ps. fluorescens and A. hydrophila bacteria. Feed was not a source of bacteria, but a redundancy analysis (RDA) revealed that the amount of feed, fish biomass, BOD5, and total suspended solids and total organic carbon were positively correlated in both Ps. fluorescens and A. hydrophila. These parameters also influenced the distribution of both potentially pathogenic bacterial populations and contributed to the bacterial contamination of water in the RAS. Our results are particularly valuable for aquacultures that help to replenish wild stocks and rebuild populations of threatened species in natural aquatic environments.

Variation of Water Quality in Fish Farm Using Recirculating Aquaculture System for Fancy Carp

2018 ◽  
Vol 19 (1) ◽  
pp. 37-45
Author(s):  
Woo Jin Lee ◽  
Seon Woo Baek ◽  
Ha Na Seo ◽  
Byeong Wook Kong ◽  
Deog Gwan Ra ◽  
...  
Keyword(s):  
Water Quality ◽  
Fish Farm ◽  
Recirculating Aquaculture System ◽  
Recirculating Aquaculture ◽  
Aquaculture System
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